Looking for e-mail app that allows searching in sub folders for specific e-mail.

Is there an e-mail app that allows you to search for a specific e-mail within a sub folder. It seems like all of them search for a keyword in every folder when I desperately need it to just search for e-mails in one of the sub folders.

As an example, I know Jane Doe e-mailed me a report for my ED project and I need to pull up it quickly. My ED project has thousands of e-mails from all kinds of people so I can't find Jane's report. Jane has also e-mailed me or been copied on e-mails thousands of times on other projects so searching for her name doesn't help if it brings up every e-mail in every folder that contains Jane's name. I need to be able to select a sub folder and search for content within that sub folder.

I'm on Office 365 so the e-mail app would need to support that. Surprisingly, I'm having a very difficult time finding an app capable of doing this.